The brown shirt with it also looks ok, although it has pockets on the chest, but it looks ok.

One of you should get better pictures of the inside and the attachment of the collar patches, the cuff title, and a close up of the rhombus. And of the buttons, and all relevant details.
Also, whatever stamps are inside, either SS stamps or Czech stamps or man in the moon stamps.

I own three SD/Sipo black uniforms.

They are all higher quality, and tailor made with marks and name tags, in two cases; but I have seen officer uniforms in this quality, too.